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Add to My Garden Black spruce 'Nana'
Picea mariana 'Nana'
Also known as : Swamp spruce 'Nana'
Black spruce 'Nana' are a group of coniferous trees that are of great value to humans in many ways. The wood is used in everything from housing and frame construction to papermaking and crafting musical instruments. Most species grow in handsome, conical shapes, making them popular ornamentals. Many boreal and temperate high-altitude forests around the world are also comprised largely of black spruce 'Nana', making them tremendously ecologically important.
Hardiness Zones
3 to 7
Care Guide for Black spruce 'Nana'
Drought-tolerant. Allow the soil to dry completely between watering.
Clay, Loam, Sand
Full sun, Partial sun
3 to 7
Know the light your plants really get.
Find the best spots for them to optimize their health, simply using your phone.
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Black spruce 'Nana'
Sunlight
Full sun
Hardiness Zones
3 to 7
Download and print this plant care card and attach it to your plants
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Black spruce 'Nana'
Sunlight
Full sun
Hardiness Zones
3 to 7
Download
Black spruce 'Nana'
Sunlight
Full sun
Hardiness Zones
3 to 7
Download
More About How-Tos
Lighting
Full sun
Temperature
-30 35 ℃
Common Pests & Diseases
Common issues for Black spruce 'Nana' based on 10 million real cases
Longhorn beetles
The longhorn beetle is a medium- to large-sized insect with very long antennae and strong jaws. Both its adult and larval stages gnaw on tree trunks, leaving small, round holes.
Solutions: Some longhorn beetles species are native insects, and they cause little damage. Therefore, these don't warrant control. Other longhorn beetles species are invasive pests that were recently introduced from other areas. These species can cause a great deal of damage to hardwood trees. Apply an insecticide containing imidacloprid as a soil injection or trunk injection following product instructions. This will enter into new grow and kill adults who feed on foliage. This will not help save trees that are already infested with large amounts of larvae, but it will save trees located near an infested tree. Contact an arborist for best control practices regarding infected trees. To properly control longhorn beetles, all host plants in a given area must be treated. Contact a local extension agent or state agency. Tracking the spread of longhorn beetles is a key component of their control.
Branch blight
Branch blight can cause lignified branches to dry up entirely and die.
Solutions: Inspect trees frequently, and remove any infected branches as soon as possible. Branch blight cannot be cured, so the only treatment is to prune the tree and monitor it carefully for signs of the disease. All affected parts of the tree should be removed, since blight can survive over the winter inside the plant’s tissues. Blight can become systemic in the tree, in which case the entire plant should be removed so it does not remain a host for the pathogen and allow it to spread.
Dieback
There are several possible causes for dieback.
Solutions: There are a few things to try when dieback becomes apparent: Fertilize and water the plants - these two steps, along with judicious pruning, can help reduce the stress on the root system and encourage renewed vigor Have an arborist check to see if plant roots are girdling Test soil pH and adjust accordingly Remove and destroy infected twigs and branches
Fire ants
Fire ants gnaw on the roots of plants and are aggressive toward people.
Solutions: Caution: fire ants are venomous and cause painful bites which can be fatal in the case of a rare but significant allergy. Fire ants can be a painful pest to have around for you and your plants. Keeping them under control will ensure comfortable gardening for all. For less severe cases: Physically remove mounds. Dig out and remove entire mounds (remember, they go deeper than they seem). Use citrus oil. Pour citrus oil, which is toxic to fire ants, down their holes. For severe cases: Use ant bait. For a chemical solution, broadcast insecticide bait formulated for fire ants in the area around a mound. Apply the bait during a dry evening so the ants can forage for it at night. Look for products that contain Indoxacarb. Release phorid flies. Introduce or promote beneficial phorid flies to gardens. These parasitic flies attack invasive fire ants. Hire a professional. Some ant baits are only available to professional exterminators. For serious cases of fire ants, consider hiring a professional.
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Longhorn beetles
The longhorn beetle is a medium- to large-sized insect with very long antennae and strong jaws. Both its adult and larval stages gnaw on tree trunks, leaving small, round holes.
Overview
Longhorn beetles are characterized by extremely long antennae which are often as long as, or longer, than the beetle's body. Adult longhorn beetles vary in size, shape, and coloration, depending upon the species. They may be 6 to 76 mm long. The larvae are worm-like with a wrinkled, white to yellowish body and a brown head.
Longhorn beetles are active throughout the year, but adults are most active in the summer and fall. Larvae feed on wood throughout the year.
Both larvae and adults feed on woody tissue. Some of the most susceptible species include ash, birch, elm, poplar, and willow.
If left untreated, longhorn beetles can kill trees.
Symptom Analysis
Longhorn beetles are attracted to wounded, dying, or freshly-cut hardwood trees. Adults lay their eggs in the spring, summer, and fall on the bark of greenwood. There may be sap around egg-laying sites.
Once the eggs hatch, larvae called round-headed borers burrow into the trunk to feed. They may tunnel for one to three years depending on the wood's nutritional content. As the larvae feed, they release sawdust-like frass at the base of the tree.
Eventually, the larvae turn into pupae and then adults. When the adults emerge, they leave 1 cm holes in the bark on their way out. Adults feed on leaves, bark, and shoots of trees before laying eggs.
After a few years of being fed upon by longhorn beetles, a tree will begin losing leaves. Eventually, it will die.
Solutions
Some longhorn beetles species are native insects, and they cause little damage. Therefore, these don't warrant control.
Other longhorn beetles species are invasive pests that were recently introduced from other areas. These species can cause a great deal of damage to hardwood trees.
- Apply an insecticide containing imidacloprid as a soil injection or trunk injection following product instructions. This will enter into new grow and kill adults who feed on foliage. This will not help save trees that are already infested with large amounts of larvae, but it will save trees located near an infested tree.
- Contact an arborist for best control practices regarding infected trees.
- To properly control longhorn beetles, all host plants in a given area must be treated.
- Contact a local extension agent or state agency. Tracking the spread of longhorn beetles is a key component of their control.
Prevention
- Keeping trees healthy, uninjured, and unstressed will help prevent beetle infestation. Water trees appropriately, giving neither too much nor too little.
- Check with local tree companies about which tree species have fewer problems.
- Avoid moving firewood as this can introduce exotic longhorn beetles.
- Routine spraying of persistent, broad-spectrum insecticides will help prevent re-infestation of previously affected trees or infestation of unaffected trees.
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Branch blight
Branch blight can cause lignified branches to dry up entirely and die.
Overview
"Blight" is an umbrella term used to describe a category of tree diseases caused by fungus or bacteria. Branch blight occurs when fungus attacks the branches and twigs of a tree, resulting in branches slowly dying off.
Branch blight can affect most species of trees to some degree, and it may be called by different names including twig blight or stem blight. It is caused by a variety of fungi which attack branches first, especially immature growth.
Blight usually occurs in warm, humid conditions, so is most common in the spring and summer months. Because specific environmental conditions are required, the frequency of branch blight can vary from year to year. This makes the disease hard to control, as it can spread between trees and affect multiple plants in a short period of time.
In the worst-case scenario, trees can lose significant portions of their foliage and fail to produce fruit. Young or unhealthy trees could die off completely.
Symptom Analysis
The first symptoms of branch blight are that the emerging foliage turns brown or gray at the tips, especially on the smallest branches. Brown spots cover the entire surface of the leaves, eventually causing leaves and stems to shrivel and fall off. Over time, the dying tissue will spread toward the center of the plant. If left untreated, spores from the attacking fungus may appear on dying foliage within 3-4 weeks of the infection.
In some cases, lesions may form at the spot where the twig branches off from the healthy tissue. Branches may display girdling, which is a band of damaged tissue encircling the branch. An untreated tree will eventually lose all of its foliage and die.
Disease Cause
- Pathogens on young twigs and foliage cause disease
- Stressed and unhealthy trees are more susceptible - root injury due to physical or insect damage, infection, or aging can prevent adequate absorption of water and nutrients
- Extremely wet conditions including sprinkler watering can attract fungus
- Fungi can be transmitted between nearby trees
Solutions
- Inspect trees frequently, and remove any infected branches as soon as possible. Branch blight cannot be cured, so the only treatment is to prune the tree and monitor it carefully for signs of the disease.
- All affected parts of the tree should be removed, since blight can survive over the winter inside the plant’s tissues.
- Blight can become systemic in the tree, in which case the entire plant should be removed so it does not remain a host for the pathogen and allow it to spread.
Prevention
- Avoid purchasing trees with dead or dying growth.
- Sterilize cutting tools frequently when pruning to avoid spreading fungus between plants.
- Keep trees mulched and watered, especially during dry periods, to prevent stress.
- Avoid splashing water on the leaves when watering, as wet foliage is attractive to fungi and bacteria.
- When planting, allow enough room between trees that there will be sufficient air circulation for them to dry out. Crowding trees too close together can increase humidity and allow the fungi to transfer.
- When conditions are wet and humid, a fungicide can be used on new growth.
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Scan the QR code with your phone camera to download the app
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Dieback
There are several possible causes for dieback.
Overview
Dealing with dieback in plants can be tricky, in part because this is both the name of a disease itself and a common symptom of many other types of diseases. Dieback can be characterized by the progressive, gradual death of shoots, twigs, roots, and branches, generally starting first at the tips.
In many cases, dieback is caused by fungi or bacteria. These pathogens can produce cankers, wilts, stem or root rots, and even anthracnose, but the most common symptom, of course, is that various plant parts (or the entire plant) will begin to die back.
Symptom Analysis
The symptoms of dieback can be gradual or slightly more abrupt. Usually, however, they are slow in developing and tend to be uniform among the various parts of a plant.
Some plants may have more localized symptoms, with all twigs affected or all branches affected but not the rest of the plant. Some potential symptoms include:
- Dead or dying branches and twigs
- Dieback that starts in the top of a plant and progresses downward (though it can start lower, especially for conifers)
- A delayed flush of growth in the spring
- Leaf margins become scorched
- Pale green or yellow leaves
- Leaves that are small or otherwise distorted
- Early leaf drop
- Reduced growth of twigs and stems
- Thinning of crown foliage
- Production of suckers on trunk and branches
- Premature fall coloration (in tree species like birch, sweetgum, maple, oak, ash, etc)
The symptoms of dieback can occur within just one season or become worse each and every year.
Disease Cause
There are several types of dieback, each of which has a different cause with which it is associated.
"dieback" as a standalone issue, including the condition known as Staghead, is caused by fungal or bacterial infections. Staghead is a slow dieback that occurs on the upper branches of a tree, named as such because the dead limbs look much like the head of a stag.
Other causes of dieback symptoms include:
- Cankers or wilts
- Stem or root rots
- Nematodes
- Stem or root boring insects
- Pavement being placed over root systems
- Winter injury from cold
- Salt damage
- Lack of moisture (or excess of moisture)
- Lack of an essential nutrient or element
Trees and shrubs that are attacked by insects, exposed to extremely high or low temperatures, or experience severe and frequent fluctuations in soil moisture are the most likely to suffer from dieback. These stress factors alone or in combination with each other can reduce leaf and shoot growth, and progress into death of twigs and branches.
Although any of these issues can lead to dieback, the most serious consequences tend to occur when the roots of a plant are damaged. Similarly, trees and shrubs that are planted improperly or in unfavorable locations are more likely to develop this condition.
Solutions
There are a few things to try when dieback becomes apparent:
- Fertilize and water the plants - these two steps, along with judicious pruning, can help reduce the stress on the root system and encourage renewed vigor
- Have an arborist check to see if plant roots are girdling
- Test soil pH and adjust accordingly
- Remove and destroy infected twigs and branches
Prevention
The best way to prevent dieback is to match the plant to the site. Make sure the conditions provided for a new planting match its needs.
- Plant properly in deep, fertile well-draining soil
- Make sure plant roots won’t be confined when the plant reaches its mature size
- Avoid changes to the growing site
- If soil compaction might be an issue, apply a few inches of wood chips and eliminate traffic over the root area
- Fertilize and water appropriately
It is also important to avoid potential infection with pathogens that can cause dieback:
- Avoid binding or wounding the roots and trunk whenever possible
- Avoid excessive pruning
- Disinfect all tools before working with plants to reduce the spread of disease
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Fire ants
Fire ants gnaw on the roots of plants and are aggressive toward people.
Overview
Fire ants are a group of ants that are known for their aggressive behavior and painful stings. Some fire ants are native and others are invasive from other countries. Once they reach plants, they climb them and chew away at leaves and flower buds.
Fire ants also kill and eat beneficial insects such as caterpillars, ladybugs, mantis, and native ants. They can be a problem any time temperatures are above freezing, but new infestations are most likely to appear when brought in via contaminated material such as potting soil or mulch, or when insecticides have harmed populations of beneficial insects that would otherwise control populations of fire ants.
They can be difficult to control, especially once populations become large. Plant damage is typically minor, but fire ants can destroy seedlings.
Symptom Analysis
The number one symptom of fire ants is seeing the ants themselves which are red or black in color. Ant mounds in the ground are also signs. Fire ant mounds rarely exceed 46 cm in diameter. If a fire ant mound is disturbed, many fast-moving, aggressive ants will emerge. These ants will bite and then painfully sting.
Even if no ants are visible, their damage might be apparent. Chewed leaf and flower edges might indicate fire ants. Fully eaten seedlings are another sign.
Solutions
Caution: fire ants are venomous and cause painful bites which can be fatal in the case of a rare but significant allergy.
Fire ants can be a painful pest to have around for you and your plants. Keeping them under control will ensure comfortable gardening for all.
For less severe cases:
- Physically remove mounds. Dig out and remove entire mounds (remember, they go deeper than they seem).
- Use citrus oil. Pour citrus oil, which is toxic to fire ants, down their holes.
For severe cases:
- Use ant bait. For a chemical solution, broadcast insecticide bait formulated for fire ants in the area around a mound. Apply the bait during a dry evening so the ants can forage for it at night. Look for products that contain Indoxacarb.
- Release phorid flies. Introduce or promote beneficial phorid flies to gardens. These parasitic flies attack invasive fire ants.
- Hire a professional. Some ant baits are only available to professional exterminators. For serious cases of fire ants, consider hiring a professional.
Prevention
Fire ants become more difficult to control as they establish themselves, so try to prevent them or treat them early.
- Monitor new material. Do not bring in any soil or plants from known infested areas, unless if they are "Quarantine Approved." Make sure to check new material for fire ants.
- Apply insecticide. Some warm and humid areas have high fire ants populations. In these areas, spread a granular fire ants insecticide such as Varsity in the spring near gardens to prevent these unwelcome visitors.
- Treat early. Spot treat at the first sight of any fire ants mound, as larger mounds are more difficult to treat.
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More Info
Plant Type
Tree
Scientific Classification
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About
Care Guide
More About How-Tos
Pests & Diseases
More Info
Related Articles
Add to My Garden Black spruce 'Nana'
Picea mariana 'Nana'
Also known as: Swamp spruce 'Nana'
Black spruce 'Nana' are a group of coniferous trees that are of great value to humans in many ways. The wood is used in everything from housing and frame construction to papermaking and crafting musical instruments. Most species grow in handsome, conical shapes, making them popular ornamentals. Many boreal and temperate high-altitude forests around the world are also comprised largely of black spruce 'Nana', making them tremendously ecologically important.
Hardiness Zones
3 to 7
Care Guide for Black spruce 'Nana'
Water
Drought-tolerant. Allow the soil to dry completely between watering.
Soil
Clay, Loam, Sand
Sunlight
Full sun, Partial sun
Hardiness Zones
3 to 7
Know the light your plants really get.
Find the best spots for them to optimize their health, simply using your phone.
Download the App
Download
More About How-Tos
Common Pests & Diseases
Common issues for Black spruce 'Nana' based on 10 million real cases
Longhorn beetles
The longhorn beetle is a medium- to large-sized insect with very long antennae and strong jaws. Both its adult and larval stages gnaw on tree trunks, leaving small, round holes.
Solutions: Some longhorn beetles species are native insects, and they cause little damage. Therefore, these don't warrant control. Other longhorn beetles species are invasive pests that were recently introduced from other areas. These species can cause a great deal of damage to hardwood trees. Apply an insecticide containing imidacloprid as a soil injection or trunk injection following product instructions. This will enter into new grow and kill adults who feed on foliage. This will not help save trees that are already infested with large amounts of larvae, but it will save trees located near an infested tree. Contact an arborist for best control practices regarding infected trees. To properly control longhorn beetles, all host plants in a given area must be treated. Contact a local extension agent or state agency. Tracking the spread of longhorn beetles is a key component of their control.
Learn More ![more]()
Branch blight
Branch blight can cause lignified branches to dry up entirely and die.
Solutions: Inspect trees frequently, and remove any infected branches as soon as possible. Branch blight cannot be cured, so the only treatment is to prune the tree and monitor it carefully for signs of the disease. All affected parts of the tree should be removed, since blight can survive over the winter inside the plant’s tissues. Blight can become systemic in the tree, in which case the entire plant should be removed so it does not remain a host for the pathogen and allow it to spread.
Learn More ![more]()
Dieback
There are several possible causes for dieback.
Solutions: There are a few things to try when dieback becomes apparent: Fertilize and water the plants - these two steps, along with judicious pruning, can help reduce the stress on the root system and encourage renewed vigor Have an arborist check to see if plant roots are girdling Test soil pH and adjust accordingly Remove and destroy infected twigs and branches
Learn More ![more]()
Fire ants
Fire ants gnaw on the roots of plants and are aggressive toward people.
Solutions: Caution: fire ants are venomous and cause painful bites which can be fatal in the case of a rare but significant allergy. Fire ants can be a painful pest to have around for you and your plants. Keeping them under control will ensure comfortable gardening for all. For less severe cases: Physically remove mounds. Dig out and remove entire mounds (remember, they go deeper than they seem). Use citrus oil. Pour citrus oil, which is toxic to fire ants, down their holes. For severe cases: Use ant bait. For a chemical solution, broadcast insecticide bait formulated for fire ants in the area around a mound. Apply the bait during a dry evening so the ants can forage for it at night. Look for products that contain Indoxacarb. Release phorid flies. Introduce or promote beneficial phorid flies to gardens. These parasitic flies attack invasive fire ants. Hire a professional. Some ant baits are only available to professional exterminators. For serious cases of fire ants, consider hiring a professional.
Learn More ![more]()
Treat and prevent plant diseases.
AI-powered plant doctor helps you diagnose plant problems in seconds.
Download the App
Longhorn beetles
The longhorn beetle is a medium- to large-sized insect with very long antennae and strong jaws. Both its adult and larval stages gnaw on tree trunks, leaving small, round holes.
Overview
Longhorn beetles are characterized by extremely long antennae which are often as long as, or longer, than the beetle's body. Adult longhorn beetles vary in size, shape, and coloration, depending upon the species. They may be 6 to 76 mm long. The larvae are worm-like with a wrinkled, white to yellowish body and a brown head.
Longhorn beetles are active throughout the year, but adults are most active in the summer and fall. Larvae feed on wood throughout the year.
Both larvae and adults feed on woody tissue. Some of the most susceptible species include ash, birch, elm, poplar, and willow.
If left untreated, longhorn beetles can kill trees.
Symptom Analysis
Longhorn beetles are attracted to wounded, dying, or freshly-cut hardwood trees. Adults lay their eggs in the spring, summer, and fall on the bark of greenwood. There may be sap around egg-laying sites.
Once the eggs hatch, larvae called round-headed borers burrow into the trunk to feed. They may tunnel for one to three years depending on the wood's nutritional content. As the larvae feed, they release sawdust-like frass at the base of the tree.
Eventually, the larvae turn into pupae and then adults. When the adults emerge, they leave 1 cm holes in the bark on their way out. Adults feed on leaves, bark, and shoots of trees before laying eggs.
After a few years of being fed upon by longhorn beetles, a tree will begin losing leaves. Eventually, it will die.
Solutions
Some longhorn beetles species are native insects, and they cause little damage. Therefore, these don't warrant control.
Other longhorn beetles species are invasive pests that were recently introduced from other areas. These species can cause a great deal of damage to hardwood trees.
- Apply an insecticide containing imidacloprid as a soil injection or trunk injection following product instructions. This will enter into new grow and kill adults who feed on foliage. This will not help save trees that are already infested with large amounts of larvae, but it will save trees located near an infested tree.
- Contact an arborist for best control practices regarding infected trees.
- To properly control longhorn beetles, all host plants in a given area must be treated.
- Contact a local extension agent or state agency. Tracking the spread of longhorn beetles is a key component of their control.
Prevention
- Keeping trees healthy, uninjured, and unstressed will help prevent beetle infestation. Water trees appropriately, giving neither too much nor too little.
- Check with local tree companies about which tree species have fewer problems.
- Avoid moving firewood as this can introduce exotic longhorn beetles.
- Routine spraying of persistent, broad-spectrum insecticides will help prevent re-infestation of previously affected trees or infestation of unaffected trees.
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
unlimited guides at your fingertips...
Sign in/sign up
Branch blight
Branch blight can cause lignified branches to dry up entirely and die.
Overview
"Blight" is an umbrella term used to describe a category of tree diseases caused by fungus or bacteria. Branch blight occurs when fungus attacks the branches and twigs of a tree, resulting in branches slowly dying off.
Branch blight can affect most species of trees to some degree, and it may be called by different names including twig blight or stem blight. It is caused by a variety of fungi which attack branches first, especially immature growth.
Blight usually occurs in warm, humid conditions, so is most common in the spring and summer months. Because specific environmental conditions are required, the frequency of branch blight can vary from year to year. This makes the disease hard to control, as it can spread between trees and affect multiple plants in a short period of time.
In the worst-case scenario, trees can lose significant portions of their foliage and fail to produce fruit. Young or unhealthy trees could die off completely.
Symptom Analysis
The first symptoms of branch blight are that the emerging foliage turns brown or gray at the tips, especially on the smallest branches. Brown spots cover the entire surface of the leaves, eventually causing leaves and stems to shrivel and fall off. Over time, the dying tissue will spread toward the center of the plant. If left untreated, spores from the attacking fungus may appear on dying foliage within 3-4 weeks of the infection.
In some cases, lesions may form at the spot where the twig branches off from the healthy tissue. Branches may display girdling, which is a band of damaged tissue encircling the branch. An untreated tree will eventually lose all of its foliage and die.
Disease Cause
- Pathogens on young twigs and foliage cause disease
- Stressed and unhealthy trees are more susceptible - root injury due to physical or insect damage, infection, or aging can prevent adequate absorption of water and nutrients
- Extremely wet conditions including sprinkler watering can attract fungus
- Fungi can be transmitted between nearby trees
Solutions
- Inspect trees frequently, and remove any infected branches as soon as possible. Branch blight cannot be cured, so the only treatment is to prune the tree and monitor it carefully for signs of the disease.
- All affected parts of the tree should be removed, since blight can survive over the winter inside the plant’s tissues.
- Blight can become systemic in the tree, in which case the entire plant should be removed so it does not remain a host for the pathogen and allow it to spread.
Prevention
- Avoid purchasing trees with dead or dying growth.
- Sterilize cutting tools frequently when pruning to avoid spreading fungus between plants.
- Keep trees mulched and watered, especially during dry periods, to prevent stress.
- Avoid splashing water on the leaves when watering, as wet foliage is attractive to fungi and bacteria.
- When planting, allow enough room between trees that there will be sufficient air circulation for them to dry out. Crowding trees too close together can increase humidity and allow the fungi to transfer.
- When conditions are wet and humid, a fungicide can be used on new growth.
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
unlimited guides at your fingertips...
Sign in/sign up
Dieback
There are several possible causes for dieback.
Overview
Dealing with dieback in plants can be tricky, in part because this is both the name of a disease itself and a common symptom of many other types of diseases. Dieback can be characterized by the progressive, gradual death of shoots, twigs, roots, and branches, generally starting first at the tips.
In many cases, dieback is caused by fungi or bacteria. These pathogens can produce cankers, wilts, stem or root rots, and even anthracnose, but the most common symptom, of course, is that various plant parts (or the entire plant) will begin to die back.
Symptom Analysis
The symptoms of dieback can be gradual or slightly more abrupt. Usually, however, they are slow in developing and tend to be uniform among the various parts of a plant.
Some plants may have more localized symptoms, with all twigs affected or all branches affected but not the rest of the plant. Some potential symptoms include:
- Dead or dying branches and twigs
- Dieback that starts in the top of a plant and progresses downward (though it can start lower, especially for conifers)
- A delayed flush of growth in the spring
- Leaf margins become scorched
- Pale green or yellow leaves
- Leaves that are small or otherwise distorted
- Early leaf drop
- Reduced growth of twigs and stems
- Thinning of crown foliage
- Production of suckers on trunk and branches
- Premature fall coloration (in tree species like birch, sweetgum, maple, oak, ash, etc)
The symptoms of dieback can occur within just one season or become worse each and every year.
Disease Cause
There are several types of dieback, each of which has a different cause with which it is associated.
"dieback" as a standalone issue, including the condition known as Staghead, is caused by fungal or bacterial infections. Staghead is a slow dieback that occurs on the upper branches of a tree, named as such because the dead limbs look much like the head of a stag.
Other causes of dieback symptoms include:
- Cankers or wilts
- Stem or root rots
- Nematodes
- Stem or root boring insects
- Pavement being placed over root systems
- Winter injury from cold
- Salt damage
- Lack of moisture (or excess of moisture)
- Lack of an essential nutrient or element
Trees and shrubs that are attacked by insects, exposed to extremely high or low temperatures, or experience severe and frequent fluctuations in soil moisture are the most likely to suffer from dieback. These stress factors alone or in combination with each other can reduce leaf and shoot growth, and progress into death of twigs and branches.
Although any of these issues can lead to dieback, the most serious consequences tend to occur when the roots of a plant are damaged. Similarly, trees and shrubs that are planted improperly or in unfavorable locations are more likely to develop this condition.
Solutions
There are a few things to try when dieback becomes apparent:
- Fertilize and water the plants - these two steps, along with judicious pruning, can help reduce the stress on the root system and encourage renewed vigor
- Have an arborist check to see if plant roots are girdling
- Test soil pH and adjust accordingly
- Remove and destroy infected twigs and branches
Prevention
The best way to prevent dieback is to match the plant to the site. Make sure the conditions provided for a new planting match its needs.
- Plant properly in deep, fertile well-draining soil
- Make sure plant roots won’t be confined when the plant reaches its mature size
- Avoid changes to the growing site
- If soil compaction might be an issue, apply a few inches of wood chips and eliminate traffic over the root area
- Fertilize and water appropriately
It is also important to avoid potential infection with pathogens that can cause dieback:
- Avoid binding or wounding the roots and trunk whenever possible
- Avoid excessive pruning
- Disinfect all tools before working with plants to reduce the spread of disease
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Fire ants
Fire ants gnaw on the roots of plants and are aggressive toward people.
Overview
Fire ants are a group of ants that are known for their aggressive behavior and painful stings. Some fire ants are native and others are invasive from other countries. Once they reach plants, they climb them and chew away at leaves and flower buds.
Fire ants also kill and eat beneficial insects such as caterpillars, ladybugs, mantis, and native ants. They can be a problem any time temperatures are above freezing, but new infestations are most likely to appear when brought in via contaminated material such as potting soil or mulch, or when insecticides have harmed populations of beneficial insects that would otherwise control populations of fire ants.
They can be difficult to control, especially once populations become large. Plant damage is typically minor, but fire ants can destroy seedlings.
Symptom Analysis
The number one symptom of fire ants is seeing the ants themselves which are red or black in color. Ant mounds in the ground are also signs. Fire ant mounds rarely exceed 46 cm in diameter. If a fire ant mound is disturbed, many fast-moving, aggressive ants will emerge. These ants will bite and then painfully sting.
Even if no ants are visible, their damage might be apparent. Chewed leaf and flower edges might indicate fire ants. Fully eaten seedlings are another sign.
Solutions
Caution: fire ants are venomous and cause painful bites which can be fatal in the case of a rare but significant allergy.
Fire ants can be a painful pest to have around for you and your plants. Keeping them under control will ensure comfortable gardening for all.
For less severe cases:
- Physically remove mounds. Dig out and remove entire mounds (remember, they go deeper than they seem).
- Use citrus oil. Pour citrus oil, which is toxic to fire ants, down their holes.
For severe cases:
- Use ant bait. For a chemical solution, broadcast insecticide bait formulated for fire ants in the area around a mound. Apply the bait during a dry evening so the ants can forage for it at night. Look for products that contain Indoxacarb.
- Release phorid flies. Introduce or promote beneficial phorid flies to gardens. These parasitic flies attack invasive fire ants.
- Hire a professional. Some ant baits are only available to professional exterminators. For serious cases of fire ants, consider hiring a professional.
Prevention
Fire ants become more difficult to control as they establish themselves, so try to prevent them or treat them early.
- Monitor new material. Do not bring in any soil or plants from known infested areas, unless if they are "Quarantine Approved." Make sure to check new material for fire ants.
- Apply insecticide. Some warm and humid areas have high fire ants populations. In these areas, spread a granular fire ants insecticide such as Varsity in the spring near gardens to prevent these unwelcome visitors.
- Treat early. Spot treat at the first sight of any fire ants mound, as larger mounds are more difficult to treat.
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